Electric-arc lamp



2 Sheets-Sheet; 1.

(No Model.)

B. A. EDWARDS.

ELECTRIC ARC LAMP.

No. 275,173. Patented Apr. 3,1883.

(No Model.) 2 Sheets-Sheet 2.

' E. A. EDWARDS.

ELECTRIC ARC LAMP.

No. 275,173. Patented Apr. 3,1883

PATENT OFFICE.

EDGAR A. EDWARDS, OF CINCINNATI,

ASSIGNOR TO OSCAR M. GOTTSUHALL,

TRUSTEE, OF DAYTON, UHIO.

ELECTRIC-ARC LAMP.-

SPEOIFIGATION forming part of Letters Patent No. 275,173, dated April 3, 1888,

Application tiled March 7, 1883. (X model.)

To all whom it may concern:

' Be it known that I, EDGAR A. Enwnens, a citizen of the United States, and a resident of Cincinnati, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Electric Lights, of which the following is a specification.

My invention relates to improvements in electric-light regulators, or mechanism for the adjustmentof carbons in electric-arc lamps in which two or more sets of carbons are successively burned, so the period that a lamp will operate with outrenewingthe carbonsis extended by the number of sets of carbons employed.

[5 My invention is particularly designed as an improvement upon the construction of regulator shown and described in a pending application for United States Letters Patent filed by me October 17, 1882.

The nature and objects of my invention will be fully explained in the description of the accompanying drawings.

Figure 1 represents a front elevation with a part of the case removed. Fig. 2 represents a central section on line y 3 Fig. Fig. 3 is a top plan view of Fig. 1. Fig. 4. is a section on line a: m, Fig. Fig. 5 is a side elevation of thearmature-liftingarm and connecting clutchrod. Fig. 6 is a perspective view ofpolar pro- 0 jection attached to principal core. Fig. 7 represents a diagram of the connection, showing two sets of carbons connected in multiple-arc circuit. Fi 8 is a perspective view of one of the polar projections shown in Fi 4-. Fig. 9

5 is a broken section, showing the stop on one of the carbon-holders. Fig. 10 is a sectional elevation, showing the loose connection of.

clutch-lever with the connecting-rod.

A A represent the case in which the oper- 4o ative parts of the adjusting mechanism are inclosed, being the ordinary lamp-case.

B Brepresent the coils of the principal in net, which are wound upon a hollow iron core. They are wound with continuous wire, one

5 end of which is preferably connected in circuit 1 through a binding-post in the usual manner, the other end of said wire being connected to case A, which is of metal, thus forming part of the circuit. The ends 13 B are thus of opposite polarity, 0 being the neutral point. In practice the helices B B may be wound and connected in multiple are.

C U represent coils of a magnet, placed in the case opposite to coilsB B, which coils are wound with a continuous tine wire, so as to form a coil of considerable resistance and connected in derivation of the are.

D 1) represent diamagnetic heads secured to the cores of the magnets, and serve to hold the wire in place, and also serve toi'ormbrack ets, by means of which the mechanism is attached to the case A by means of screws d.

E represents a polar projection of the principal magnet B, and E a similar polar projection ofthe shunt-magnet 0 0. They are magnetically connected to their respective cores by soft-iron screws 0. These polar projections are preferably oi U or horseshoe shape. The adjacent ends of the polar projections E are placed in the same planes and opposite to those of polar projections E, and a suflicient distance apart to allow pendent armatures F and G to be pivoted between and to the opposite ends of theserespectivemagnetprojections by diamagnetic pivots or centers in such manner as to allow these arniatures to move freely. The armatures F and G are each provided with projecting arms 9 and f, rigidly attached to their respective armatures, preferably near the pivoted ends thereof. I ll represents a connecting clutch-rod, the upper end of which is pivoted in a slot or mortise made in the outer end of lifting-arm g. 1 represents a similar connecting-rod, pivoted in like manner to the lifting-arm j.

J represents a clutch, one end of which is loosely supported in a slot or loop in the lower end of connecting-rod H, as shown in Fig. 10. This connection of the clutch J to rod ll should i be sufficiently loose to compensate for the are Lil or circular movement of the connecting-rod H, thereby allowing the clutch to move in a vertical line.

K represents a similar clutch, connected in like manner with rod 1.

L and M represent the upper carbon rods, which are of usual construction, and which project through the hollow cores and are provided with suitable hearings in the case.

N represents a semicircular polar projection of the shunt-magnet, to the core of which itis connected by soft-iron screws n a. The ends of these projections are preferably turned upward, and correspond in size with the armatures F and G, the projecting faces of which are segments corresponding with the circle described by the ends of the swinging armatures Fand G,there beingjustsutficient space between the ends of the armatnres F and G and the polar projections D to preventactual contact of the parts.

0 represents a polar projection of the principal magnet, to the core of which it is attached by soft-iron screws 0. It projects radially inward, and is turned upward and terminates in vertical planes between and in line with the face of polar projections N.

P represents a retractile spring, one end of which is connected with the outer end of the lifting-arm g, and the other end to an adjusting-screw, p, which is supported by bracket Q, secured to the neutral point of the spool of magnet C. A similar retract-ile spring is connected to the outer end of the lifting-arm f, and connected in like manner to an adjustingscrew and bracket supported on the spool of magnet B.

The device as represented in the drawings is in its normal position without current. The armatures F and G are vertical,and the lower ends occupy the relation to polar projections N and() as shown in Fig. 2, the retractile springs being adjusted so as to hold them in this position, which is the extreme outward movement. They are prevented from moving outward farther bystops,which are shown as formed by the projecting ends of the connectingrods I1 I, resting upon the bottom of caseA, so as to act as such stop. One ofthe retractile springs which controls the movement of the armature is adjusted so as to be more sensitive or of less resistance than the retractile spring controlling the movement of the opposite armature. The currentis sentinto the lamp. The magnetism of the cores, developed by the coils l3 l3, attracts the armatnres F and G inwardly toward the polar projection 0, thereby moving the lifting-armsf and 9, raising the clutches J and K, and with them the carbon-holders L and M, until a separation is effected between the two sets of carbons; but, owing to the fact thatone spring is weaker than the other, the carbon. controlled by the armature which the weaker spring regulates moves a little in ad vance ofthe opposite armature and earbon,thus

a crane effecting a greater separation between the firstnamed pair ofcarbons, hence causing agreater resistance in that branch of the circuit and breaking the are, but developing and maintaining the are between the opposite carbon until the first carbon is consumed. A stop, '1, is provided at the top of this carbon rod to arrest the downward movement of the rod when the carbons are consumed, when, by reason of the length of are thus resulting, a greater per cent. of current is shunted through the finewire helices, thus increasing the magnetism. of polar projections N sufficiently to attract the armature connected with the first pair of carbone to its first position, causing the clutch connected with it to trip, thus allowing the carbon-rod to slide through and make contact with its lower carbon, which pair are immediately separated, forming an arc of lower resistance than the arc existing between the other pair. The adjustment of either carbon as the carbons of that pair are consumed is effected by the shunting of a. portion of the current through the shunt-magnet just in pro portion to the increase of resistance caused by burning away of the carbons, thereby releasing the grasp ofthe clutch sufficiently to allow said upper-carbon holder to slidedown just enough to maintain the are. This mode of controlling and adjusting the carbons in circuit is very sensitve, and the adjustments are so constant and gradual that flickering or increase and decrease of the volume of light is practically avoided or prevented.

It will be observed that if either one of the armatures F or G were removed the remaining armature and its connecting clutch mechanism would be operative to control one of the sets of carbons.

I claim 1. In an electric-arc lamp, the combination of differential magnets of high and low resistance, U-shaped polar extensions attached to the upper poles of each magnet, and an armature pivoted between the adjacent ends of said lJ-shaped polar projections, with its free ends in close proximity to the lower pole of said magnet, substantially as described.

2. In an electric-arc lamp, the combination of ditl'erential magnets of high and low resist ance, and a semicircular polar extension connected to the lower end of one of said magnets, a polar extension, 0, connected to the opposite pole of the other magnet and terminating in the same plane and between the forks of said polar extension, substantially as described.

3. An electriclight having differential mag nets and armaturcs pivoted between the ends of polar extensions attached to the opposite poles of each magnet, the free ends of said armatures moving adjacent to and between polar points 0 N N, attached to the opposite poles of said magnets, substantially as herein set forth.

4. In an electric-arc lamp having two or IOU ITO

more sets of carbons, the combination of diflatedby separatemechanisms,substantially as :0 ferentiai magnets, two or more armatures, described.

pivoted at one end to the opposing magnet- In testimony whereof I have hereunto set poles, the free ends of said armatures moying I my hand in the presence of two subscribing adjacent to and between the polar projections witnesses.

at the opposite ends of said magnets, and EDGAR A. EDWARDS. regulating mechanisms, each connected inde- Witnesses:

pendently to one of said armatures, whereby J N0. E. JONES,

each set of carbons is independently regu- 1 ADOLPH GLUOHOWSKY. 

